Device for single-phase collector-motors with compensation-wiring.



No. 831,101. PATENTED SEPT. 18, 1906. R. RICHTER. DEVICE FOR SINGLE PHASE COLLECTOR MOTORS WITH COMPENSATION WIRING.

APPLICATION FILED NOV. 21,1905.

1 series with the armature.-

rent.

UNITED STATESE A TENT OFFICE.

RUDOLF RICHTER, OF WILMERSDORF, NEAR'BERLIN, GERMANY, ASSIGNOR TO THE SIEMENS-SCHUCKERT VVERKE G. M. B. H., OF BERLIN, GERMANY, A CORPORATION OF GERMANY.

Specification of Letters Patent.

Patented Sept. 18, 1906.

Application filed'Novomber 21,1905. Serial No. 288,390.

To all whom it may concern:

Be it known that I, RUnoLF RIoH'rER, engineer, a subject of the King of Prussia, Ger--' man Emperor, and a resident of Wilmersdorf, near Berlin, German have invented a certain new and useful ,evice for Single- Phase Collector-Motors with Compensation- Wiring, of which the following is a specification.

commutator-motors are often providedwith a compensating winding for neutralizing the transverse field produced by the armature-current, and in particular alternatingcurrent motors are arranged in this manner on well-known grounds.

The magnetomotive forces of the armature-winding and the compensation-winding are in this case equal and opposite. The compensating winding can in particular be so arranged that between the poles of the machine at those places where the direction of the current in the coil is changed auxiliary fields are'produced which allow this change to be effected without sparking at the brushes. This auxiliary means is, however, as is well known, not sufiicient in the case of alternating-current motors, as in the short-circuited coil an electromotive force occurs by transformation, in conse uence of the pulsating operative field, whic is shifted one-quarter o a period relatively to the armature-current, and consequently cannot be neutralized by means of an auxiliary winding connected in For neutralizing this electromotive force a transverse field is necessary, which (with two-pole motors) is shifted relatively to the main field both as to time and place by ninety degrees. For roducing this auxiliary transverse field a p ase displacement may be produced between the armature-current and the compensating cur- To effect this purpose, alternatingcurrent motors have been constructed with short-circuited brushes, whose axis is placed diagonally to the axis of the brushes connected to the external circuit. With these m0- tors the phases of armature-current and compensation-current are no longer rigidly coupled by the definite conductive relation of their circuits, as withthe usual compensated single-phase .motor, but onl inductively. The currents are therefore su jectto a certain phase shift relatively to each other, and

the resulting magnetomotive force gives the desired auxiliary transverse field.

The resent invention relates to another means or effecting a phase shift between are mature-current and compensation-current,

which is applicable to theusu'al'single-phase commutator-motor with compensation winding. The means consists in the 'use of a choking-coil, which is connected parallel to the armature. The armature of the compensated motor presents in working an ohmic resistance. The parallel connection of the inductive resistance therefore has the effect that the entire main current no longer passes through the armature, but only the geometrical difference between the main current and the choking-coil current. The com ensation of the armature-current is then no onger complete, and there remains a resulting magnetomotive force which is proportional to the choking-coil current and is in phase with the same.

In the drawing I have shown a compen sated single-phase motor in diagrammatic representation.

, In-said drawing, (1 indicates the armature, p the main field-poles, and h the compensation-winding, shown here in the form of the well-known auxiliary pole. d indicates a self-inductive resistance or choking-coil, which is connected in parallel with the armature a. In this way a transverse field of sufficient strength and of the'right phase can be produced which will neutralize the.electromotive force roduced on the short-circuited coil by the pu sation of the main field. As in practice the phase shift required for the said purpose between the armature-current and the compensation-current is relatively small, the above-described means is also ractically useful. The choking-coil only as to carry a very small ortion of the main current, and the loss 0 effect caused thereby is exceedingly small. The chokingcoil is of course a vantageousl so arranged that it allows of a regulation 0 the branched currents.

The described arrangement has the special advantages that the amplitude of the auxilia transverse field can be regulated at will in ependently of the other conditions, so that the mo or can work free from sparking not only under synchronism, but also at all speeds, and, furthermore, that it is applicable to ordinary compensated motors without requiring other alterations therein.

The above-described invention is of course a plicable also to 'motors whose compensation-winding is uniform, arranged for the production of auxiliary fields, which are intended to neutralize the reactance voltage-in the short-circuited coil, as hereinbefore referred-to.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed; I'da clare that what I claim is -1. In a single-phase commutator-motor, the combination with field and armature coils, and compensation-Winding in series with the armature-coils5 of a-circuit in parallel with the armature andadapted to cooperate with the compensation-winding in neu itralizing the cross-field of the armature.

2. A single-phase commutator-motorcomprising field and armature coils, compensating coils in series with the armature, anda choking-coil in parallel with the armature for the purpose set'forth.

3. A single-phase commutator-motor with field and armature coils and compensationcompensating winding wherein the armature is provided with a parallel connected choking-coil for the purpose of efiecting such a phase shift between the armature-current and the compensation-current as 'to produce a suitable transverse field in the armature for neutralizing the resulting electrornot'ive force produced in the short-circuited coil, substantially as described.

WOLDEMAR HA'UET, HENRY HASPER. 

